I spray my roses weekly to control black spot. One of the fungicides I use is Daconol (chlorothalonil) from a concentrate. Normally, I shake it up real good, and dilute it into my Roundup 1 gallon sprayer, but recently I tried it in my B+G sprayer, and very quickly I was having trouble getting anything to come out. When I pulled out the filter in the wand, it was completely encrusted in white chunky dust, that was clearly the stuff you're shaking into suspension in the Daconil. Is there something wrong with my batch, that's leaving it full of larger chunks? Should I put it in my paint can shaker, or a blender? Should I just not use my B+G sprayer with this again?